Multi-kT/m Focusing Gradient in a Linear Active Plasma Lens

Abstract

Active plasma lenses are compact devices developed as a promising beam-focusing alternative for charged particle beams, capable of short focal lengths for high-energy beams. We have previously shown that linear magnetic fields with gradients of around 0.3 kT/m can be achieved in argon-filled plasma lenses that preserve beam emittance [C.A. Lindstrøm et al., Phys. Rev. Lett. 121, 194801 (2018)]. Here we show that with argon in a 500 μm diameter capillary, the fields are still linear with a focusing gradient of 3.6 kT/m, which is an order of magnitude higher than the gradients of quadrupole magnets. The current pulses that generate the magnetic field are provided by compact Marx banks, and are highly repeatable. These results establish active plasma lenses as an ideal device for pulsed particle beam applications requiring very high focusing gradients that are uniform throughout the lens aperture.

arXiv comment8 pages, 6 figures. Submitted to Physical Review Applied

References in corpus (7)

• Emittance Preservation in an Aberration-Free Active Plasma Lens
• Staging of High-Gradient Wakefield Accelerators
• Characterization and Tuning of Ultra High Gradient Permanent Magnet Quadrupoles
• Direct Measurement of Focusing Fields in Active Plasma Lenses
• Overview of the CLEAR plasma lens experiment
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